Watch List notes:

Great Britain, silver-plated copper-zinc Admiral Vernon medal, 1739, Porto Bello, ex-Adams (Plate).AC-PBvi5E.15.15 grams, 40 mm.Choice AU+ with excellent plating, lustrous and well detailed, traces of dark encrustation in crevices of some of the fortresses, specific gravity of about 8.3, also tested (XRF) at 47.47% copper and 46.43% zinc with 3.16% silver from the plating (full results on small printout included).Pedigreed to the John Adams collection (plated on p. 91 of his book).
($350-500)